The filters size are too little, they go in but with a gap . The air bypasses the filter. For as expensive as they are, they should fit perfect, without the gap where the air isn't filtered.
Your Merv 13 looks like merv 8 at local stores.i use honey well.and the size is half inch smaller all the way around but that shouldn't matter. Haven't used them yet to see if there good or not. I live on farm with a lot of dust. Time will tell.it would be nice to see all three to tell the difference.